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# A REAL ESTATE AGENT IS CONSIDERING CHANGING HER CELL PHONE PLAN.

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Author: Christine Farr
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http://theperfecthomework.com/a-real-estate-agent-is-considering-changing-her-cell-phone-plan/

Problem 5­6A real estate agent is considering changing her cell phone plan. There are three plans to chooseof which involve a monthly service charge of \$20. Plan A has a cost of \$.39 a minute for daytime\$.19 a minute for evening calls. Plan B has a charge of \$.49 a minute for daytime calls and \$.14for evening calls. Plan C has a flat rate of \$75 with 225 minutes of calls allowed per month andof \$.36 per minute beyond that, day or evening.a Determine the total charge under each plan for this case: 140 minutes of day calls and 60 m. evening calls in a month. (Do not round intermediate calculations. Round your answerdecimal places. Omit the "\$" sign in your response.)Cost for Plan ACost for Plan BCost for Plan C\$ 86.00 Correct\$ 97.00 Correct\$ 95.00 Correctc If the agent will use the service for daytime calls, over what range of call minutes will each pl. optimal? (Round each answer to the nearest whole number.Include the indifference poin each answer.)Plan A is optimal from zero to _______minutes. Plan C is optimal from _______minutes onwad Suppose that the agent expects both daytime and evening calls. At what point (i.e., percenta. call minutes used for daytime calls) would she be indifferent between plans A and B? (Do nointermediate calculations. Enter your answer as a percentage rounded to 2 decimal pOmit the "%" sign in your response.)

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